Across the nation, Democrats have appeared increasingly bullish on taking back one or both chambers of Congress, fueled by low approval numbers for President Donald Trump and high voter enthusiasm among their supporters. With that in mind, the USA TODAY Network consulted voters, analysts and handicappers, academics and experts spread across 14 states to put together a list of 25 bellwether races - campaigns that, over the next nine months, could help indicate whether Democrats are riding a wave that could give them control of Congress.
