The radicals on the Supreme Court, like Justice Alito, said no. (They aren't conservatives, because they threw out precedent and long established wisdom, making us the only democracy not to have constitutional authority to regulate money-politics).
But the people with the money to lose? They say "Hell, yes!"; and they are spending hand-over-fist, because they know that this election could be about who pays for the failed Bush years...:
Working from color-coded master spreadsheets — one of which was obtained by The New York Times — the conservative groups are now closely monitoring polling in 80 House races that they judge crucial to ensuring a Republican majority. Based on those results, the groups have started to place their final advertising bets in ways carefully coordinated to fill openings left by the more financially limited official party and candidate committees. -NYT