In the race to represent Colorado’s 3rd Congressional District, Democratic candidates are relying almost entirely on small donors and self-funding, while the Republican incumbent has raised a significant chunk from political committees and GOP warchests. Voting is underway for the June 30 primary, in which Democrats Alex Kelloff and Dwayne Romero are vying to unseat Republican Rep. Jeff Hurd, who is facing his own primary challenger, former sta…