Adam Frisch is the Democratic candidate in Colorado's 3rd Congressional District, the seat currently held by Lauren Boebert who abandoned ship to run in the 4th CD when it seemed likely that Frisch would beat her if she ran again, even though the district is somewhere around R+7 (meaning Republicans with a seven-point registration advantage over Dems). Frisch came within about 500 votes of beating her last time (and probably would have if more people had thought it was possible) and so far this cycle he's raised a massive amount of money.
Colorado's 3rd District race is Adam Frisch against a Republican field (denverpost.com)