"It is despicable": House Democrats rage over Republican stock trading "set-up"

House Democrats went into the vote on the Stop Insider Trading Act last month groaning that it was all a big Republican set-up. Now they're fuming that the trap has been sprung. Why it matters: A well-funded Republican group is blanketing the airwaves lauding GOP lawmakers in key swing districts — including some with reputations for prolific stock trading — as champions on the issue. "Corrupt…