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A raft of new polls from states with competitive Senate races shows momentum veering away from Republican incumbents at a time when doubts are also growing about President Trump’s re-election prospects.

The big picture: To win control of the Senate, Democrats likely will have to flip five of eight competitive seats with a Republican incumbent. Of the six races with recent polling, Democrats lead in five and trail by just one point in the other.

Driving the news: Polls released Tuesday show Montana Gov. Steve Bullock (D) leading incumbent Sen. Steve Daines (R) by 7 points (sample size: 738) and North Carolina Democratic candidate Cal Cunningham beating Republican Sen. Thom Tillis by 9 points (sample size: 1,362).

Other recent numbers show an upward trend for Democrats:

What's going on: There are two main factors bolstering these Democratic candidates, Jessica Taylor of Cook Political Report tells Axios:

Between the lines: In the three states where Senate polling can be tracked before and during the crisis — Montana, North Carolina and Arizona — Democrats have gained ground in each.

  • Republican incumbents were outraised in Q1 in North Carolina, Colorado, Montana, Arizona, Maine and Georgia.

Yes, but: Democrats must also play some defense. Democratic Sen. Doug Jones' seat in Alabama, rated by Cook Political Report as "Lean Republican," presents the most likely flip for the GOP. Democratic Sen. Gary Peters is also trying to hold onto his job in Michigan (+6.8, per RCP).

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Voters cast ballots in Minnesota, Georgia, Connecticut, Wisconsin and Vermont

Photo: Spencer Platt/Getty Images

Primary elections are being held on Tuesday in Minnesota, Georgia, Connecticut, Vermont and Wisconsin.

The big picture: Georgia and Wisconsin both struggled to hold primaries during the coronavirus pandemic, but are doing so again — testing their voting systems ahead of the general election. Rep. Ilhan Omar (D-Minn.) is facing a strong challenger as she fights for her political career. In Georgia, a Republican primary runoff pits a QAnon supporter against a hardline conservative.

Biden running mate news triggers "best grassroots fundraising day ever"

Former Vice President Joe Biden and Sen. Kamala Harris hug during a March campaign rally in Detroit. Photo: Scott Olson/Getty Images

More than $10.8 million was donated in four hours after Sen. Kamala Harris was announced as presumptive Democratic presidential nominee Joe Biden's running mate Tuesday, the Democrats' main donation-processing platform ActBlue said, per the New York Times.

Why it matters: Biden is lagging behind in fundraising to President Trump, whose campaign and the Republican National Committee out-raised that of the Democrats' last month. But Biden's announcement triggered his campaign's "best fund-raising hour," his deputy digital director, Clarke Humphrey tweeted, adding it was the campaign's "best grassroots fundraising day ever." ActBlue took $2.3 million in donations during the same hours of 4pm to 8pm Monday, "suggesting a bump as large as $8.5 million" for Biden, the Times notes.

Go deeper: Political world reacts to Biden tapping Kamala Harris as running mate

Updated Aug 12, 2020 - Politics & Policy

Pelosi says Mnuchin told her White House is "not budging" on stimulus position

Democrats and the Trump administration remain "miles apart" on negotiations over a coronavirus stimulus deal, House Speaker Nancy Pelosi (D-Calif.) said on Wednesday.

The latest: Around 3 p.m., Pelosi and Senate Minority Leader Chuck Schumer (D-N.Y.) issued a statement saying that Treasury Secretary Steven Mnuchin had initiated a phone call and made clear that the White House is "not budging from their position concerning the size and scope of a legislative package."