JONATHAN TOBIN: In quest for a Trump crime, Dems refuse to take ‘no’ for an answer.

But if even a veteran grandstander like Comey — as Democrats should remember from his various statements about Hillary Clinton’s e-mail scandal during the 2016 campaign — isn’t willing to say Trump obstructed justice here, it’s obvious these hearings are about politics, not criminality.

You don’t have to think Trump acted wisely to know Democrats view the Intelligence Committee hearings as an attempt to set the stage for impeachment should the GOP lose control of Congress in 2018. The same is true of the attempt to twist Trump’s sympathy for Flynn as “a good guy [who] has been through a lot” — a sentiment Comey said he shared — into an impeachable offense. In the absence of evidence beyond Comey’s equivocal and self-serving memo, the obstruction charge against Trump is almost certainly a legal dead end.

But it keeps the base riled up.