This is Tom Perez. He is the new chairman of the Democratic National Committee, responding to a Reince Priebus tweet that promotes President Trump's weekly address:
Why it matters: Democrats aren't going to let the Russia-Trump story stop any time soon, and this is a sign they're willing to be not-so-nice about it, as Trump would put it.
Why it doesn't matter: It's a snarky tweet, sent out to focus media attention on a subject (Russia-Trump) that he wants covered.