Every church I’ve ever been to has been carefully non-partisan on candidates. It’s not just tax status, they don’t want to cause parishioners to feel unwelcome because they need the attendance.
I know some churches are being overly political, sure, but I absolutely believe the majority are doing the right thing.
There’s zero evidence that it’s happening “often” so I’m mostly using the space to point out that there’s more to “church” in America than the white evangelical politics-forward churches they see represented on TV. Those pastors are on TV because they are the exception.