Senate Majority Fight Turns Into a Toss-Up in Six States With $3.4 Billion in Spending on the Line

Since Cook Political Report shifted Texas and Iowa from leaning Republican to toss-up last week, the battle for Senate control has gone from a presumed GOP hold to a genuine coin flip, according to AP News.

Republicans currently control the Senate 53-47. Democrats need to net four seats to take the majority. Total midterm spending across all Senate races is expected to top $3.4 billion, AP reports.

Senate Majority Leader John Thune isn't pretending otherwise. "I'm a realist," Thune told South Dakota's KELOLAND News. "I don't ever try and sugarcoat things. I think it's a competitive environment right now."

Why the map moved

President Trump's approval rating fell to 32% in a July AP-NORC poll. Voters are also sour on the economy and, according to Fox News, on the war with Iran, which polling shows is unpopular and which Fox ties to record Labor Day gas prices. AP and Fox both cite these conditions for why Republicans face traditional midterm headwinds as the party in power.

Senate Democratic Leader Chuck Schumer is leaning into it. "We are going to take back the Senate," Schumer told reporters, according to Fox News. "We've blown the map wide open." Schumer separately said Democrats "found new states — Iowa, Texas — which people a year ago weren't even paying attention to."

But Republicans have a real counter-argument, and it's a fair one: Democrats still have to flip seats in states Trump carried by double digits in 2024, including Texas and Iowa, according to Ground News' synthesis of coverage. That's a heavy lift no matter how bad Trump's approval numbers look nationally. NRSC Chair Sen. Tim Scott told NBC's "Meet the Press" he's "very confident" the GOP holds the majority after November.

Michigan: Democrats can't agree on their own nominee

The open Michigan seat is Democrats' clearest opportunity — no Republican has won a Senate race there since 1994. But the party is bruised. Progressive Abdul El-Sayed narrowly beat moderate Rep. Haley Stevens in the August primary after nearly $70 million was spent attacking him, according to AP News.

Republicans think that gives Mike Rogers, who lost the 2024 Senate race by fewer than 20,000 votes, a real shot. The Senate Leadership Fund, the GOP's Senate super PAC, added $6 million in Michigan ad spending after El-Sayed's win, pushing its total there to $51 million — the third-highest of any state, AP reports. Fox News frames El-Sayed's win as evidence Democrats are nominating "extremists," pointing to a string of left-wing primary upsets nationally as ammunition for GOP messaging. AP's coverage is more measured, framing it as an intra-party rift rather than an ideological verdict on the whole party.

Maine: Collins survives one Democratic collapse, faces another candidate

Democrats saw Maine as their best shot at unseating five-term Sen. Susan Collins, in a state Kamala Harris carried in 2024. Progressive Graham Platner easily won the June nomination, then dropped out in July after a sexual assault allegation surfaced. Platner denies the allegation. No charges have been filed and no independent finding has resolved the dispute either way.

Democratic delegates picked Troy Jackson, a lesser-known former state legislative leader, in late July to replace him. Whether Jackson can generate the money and name recognition Platner had is an open question that will shape whether Maine stays competitive through November.

Texas: Paxton draws national money

In Texas, the toss-up shift has drawn outside spending fast. MAGA Inc., the main pro-Trump super PAC, put $10 million into TV and digital ads backing Texas Attorney General Ken Paxton's Senate bid, according to Ground News. State Rep. James Talarico appears positioned as a Democratic contender in a race that a year ago wasn't on anyone's competitive list.

What's unresolved

Cook Political Report's toss-up calls in Texas and Iowa are recent enough that they could move again before Election Day, particularly if Republican outside groups keep matching Democratic spending increases the way the Senate Leadership Fund did in Michigan. Whether Troy Jackson can turn Maine into a genuine threat to Collins, and whether El-Sayed can unify Michigan Democrats after a $70 million primary fight, remain the two biggest open questions heading into the fall.