Kelly Ayotte — the Sarah Palin-backed candidate in New Hampshire’s GOP Senate primary — may be looking over her shoulder tonight. Ovide Lamontagne, one of her main rivals in a crowded field, just got an eleventh-hour endorsement from Sen. Jim DeMint:

I’m proud to endorse Ovide Lamontagne for US Senate in New Hampshire. He’s a proven conservative.

The primary is on Sept. 14.