Indiana Gov. Mike Pence endorsed Ted Cruz on Friday, which may not be enough to help Cruz win Indiana, where he currently trails Donald Trump in polls, let alone the Republican nomination. Nevertheless, the endorsement is part of a pattern: With the exception of a single congressman from Western New York, no Republican who faces a competitive gubernatorial, Senate or House election this November has endorsed Trump.

Pence, a plausible presidential contender in 2020, is one of those Republicans with a lot on the line. He considered a presidential bid this year but decided to run for a second term as governor instead. However, his re-election this November is not assured. (Indiana is one of a dozen states to hold gubernatorial races in presidential years.) He’s in a tight race with Democrat John Gregg, the former speaker of the Indiana House of Representatives, whom he beat by only 3 percentage points in 2012. If this turns out to be a catastrophic November for Republicans, Pence’s governorship and his presidential hopes could be toppled.