U.S. Senator Bernie Sanders speaks at the opening of the 2015 National Action Network Convention in New York City

That was David Brock’s reaction to Sanders’ final campaign ad before the Iowa caucuses.

INDIANOLA, Iowa (AP) — With days to go before the lead-off Iowa caucuses, Hillary Clinton on Thursday ramped up her attacks on fellow Democrat Bernie Sanders, saying she is not interested in ideas that will “never make it in the real world.”

…Sanders and Clinton are locked in a tight race going into the Feb. 1 Iowa caucuses, prompting Clinton and her supporters to grow more aggressive. On Thursday, David Brock, a top Clinton ally, criticized a new ad from Sanders, saying it presents a “bizarre” image of America, focused on white voters.

Brock, a long-time Clinton supporter who runs several progressive groups aiding her candidacy said Thursday that a new Sanders ad was a, “significant slight to the Democratic base.”

He added: “From this ad it seems black lives don’t matter much to Bernie Sanders.”