One thing to say that the House Democrats can make a lot of noise. It another thing to say that they can do more to Trump than the Gingrich Congress could do to WJBC.When Congress voted to impeach Clinton, Clinton played the bongo drums. If Congress votes to impeach Trump, Trump will campaign for reelection the same way he campaigned for election in the first place. And with similar effect (which is not to predict that Trump will inevitably win, only that the campaign will look the same - and that his defeat is not foreordained.
They also have enemies in the system who are going to wage war against them. One enemy has come out in the open yesterday and thrown its hat in the ring.