He favored Trump, not because of collusion but because he hated Hillary for allegedly interfering in his election.
Via Daily Caller:
FBI Director James Comey repeatedly referred to Russian President Vladimir Putin’s personal animus to Hillary Clinton as one of the major motivations in Russian meddling in the 2016 U.S. election during congressional testimony Tuesday.
Comey described how Putin “hated Hillary Clinton so much” he developed a preference for President Donald Trump. Comey deployed a sports metaphor, saying, “I hate the New England Patriots, and no matter who they play, I’d like them to lose.”
His statements echo the main findings of the Jan. 6 U.S. intelligence community’s report on Russian attempts to undermine the 2016 election. “Russia’s goals were to undermine public faith in the US democratic process, denigrate Secretary Clinton, and harm her electability and potential presidency,” the report’s key judgement found.