Romney's campaign has hoped to broaden the electoral map by winning Wisconsin, where polls have improved for the Republican since his selection of Rep. Paul RyanPaul Davis RyanTrump clash ahead: Ron DeSantis positions himself as GOP's future in a direct-mail piece Cutting critical family support won't solve the labor crisis Juan Williams: Trump's GOP descends into farce MORE (R-Wis.) as his running mate. But the latest Quinnipiac poll shows an improvement for Obama. 

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Most recent Colorado polls have shown the two candidates neck and neck in the state. The last time Quinnipiac polled there, in early August, it found Romney holding a 5-point lead.

The polls also offer some good news for Senate Democrats. 

Former Virginia Gov. Tim KaineTimothy (Tim) Michael KaineCommunion vote puts spotlight on Hispanic Catholics Biden at Sen. John Warner's funeral: He 'gave me confidence' Overnight Defense: Joint Chiefs warn against sweeping reform to military justice system | Senate panel plans July briefing on war authorization repeal | National Guard may have 'training issues' if not reimbursed MORE (D) has a 51-44 percent lead over former Sen. George Allen (R-Va.), the first time all year that Kaine has broken the 50 percent threshold. The results might be a bit inflated for Kaine, though — most other polls of the race show it to be tied.

Rep. Tammy BaldwinTammy Suzanne BaldwinOvernight Defense: Pentagon pulling some air defense assets from Middle East | Dems introduce resolution apologizing to LGBT community for discrimination | White House denies pausing military aid package to Ukraine Democrats introduce resolution apologizing to LGBT community for government discrimination Overnight Health Care: Takeaways on the Supreme Court's Obamacare decision | COVID-19 cost 5.5 million years of American life | Biden administration investing billions in antiviral pills for COVID-19 MORE (D-Wis.) and former Wisconsin Gov. Tommy Thompson (R) are tied in their Senate race, according to the poll. Thompson started off the general election with much higher name identification statewide and led in polling a month ago, but Baldwin and her allies have outspent him on the airwaves in recent weeks. This is the third poll in as many days to show her improving in the state, though the other two were Democratic polls.

The polls of more than 1,400 likely voters in each state were conducted from Sept. 11-17, and had margins of error of plus or minus 2.5 percent in Colorado and Wisconsin and 2.6 percent in Virginia.