All 435 seats in the House of Representatives are on the ballot when voters head to the polls on Nov. 3. But spread across the political map, there are 16 races that ABC News rates as tossup in which the outcomes are expected to come down to the wire and will be crucial to determining the balance of power in the House for the 120th Congress.

Sen. Roger Marshall asks Kansans for their vote to reelect him. He says he’ll fight for border security, safe towns, low taxes and family values.

Down-ballot battlegrounds for congressional seats have also drawn millions in last-minute advertising in Central Florida.

The only poll that matters is on Election Day, but polling and early voting returns point to four Texas House races in Harris County where Democrats stand a chance of flipping Republican seats.