Here are the 2020 Senate races to watch as the COVID-19 election comes into focus

The bill also kept North Carolina from running its own health benefit exchange.Iowa: Iowa Sen. Joni Ernst finds herself in a close reelection contest as Trump's support in the state dips.Trump won Iowa by a comfortable 10 percentage points four years ago, but he's ahead of Biden by about 3 percentage points in a new Monmouth University survey.Ernst, a first-term senator, has also seen her support soften a bit.Democrat Theresa Greenfield was leading by 3 percentage points in a June poll conducted by the Des Moines Register.But Ernst bounced back in the Monmouth University poll released this month leading by roughly 3 percentage points.The Cook Political Report, a  nonpartisan analyst website, has moved the Iowa race from "leans Republican" to toss-up.Montana: Democrats recruited outgoing Gov. Steve Bullock to challenge Sen. Steve Daines in a state Trump easily won in 2016."Unlike other states with candidates newer to the statewide ballot, Bullock is already well-defined in voters' minds, and it may be harder to change voters' opinions of him," Jessica Taylor, who tracks Senate races for the Cook Political Report, said in June.Daines is leading by roughly 6 percentage points in the most recent Emerson College survey after he went on the offensive. Kentucky: Democrat Amy McGrath wants to unseat Senate Majority Leader Mitch McConnell and she's raised plenty of money towards that goal.McGrath, a retired Marine, has raked in $47.2 million, which according to the Federal Election Commission is the most of any candidate, incumbent or challenger, running for Senate this year.But McGrath was rattled when during the Democratic primary by an underdog state legislator who came within two points of winning.The Cook Report, a political analyst website continues to rank Kentucky as likely Republican and given it is a state Trump won by 30% Democrats face a mountain climb to make this race competitive.McGrath has tried to appeal to those voters by arguing those who supported the president wanted a sea change in Washington and are equally fed up with McConnell, who is consistently ranked as one of the most unpopular senators in the country.Initial general election polls showed McConnell with a commanding 17 percentage point lead, but other surveys showed McGrath within 5 percentage points.The McGrath campaign said it believes the race is tightening, and shook things up on Friday when it announced Democratic consultant Dan Kanninen, who previously worked on Mike Bloomberg's presidential campaign, will be replacing Mark Nickolas as campaign manager.Reporter Phillip M.