Data: Axios Research, Dave Leip's Atlas of U.S. Elections; Chart: Andrew Witherspoon/Axios
While Republicans are giddy about their chances for regaining the House next year, GOP prospects for taking the Senate remain more uncertain, data reviewed by Axios suggests.
By the numbers: At least five Republican senators are retiring after the midterms, and four of their seats are in battleground states. That makes a simple Republican-for-Republican election exchange all the more difficult.
