Story highlights Clinton's super PAC says it will scale back advertising

It's because her polling has improved in some states

Philadelphia (CNN) Hillary Clinton's super PAC won't air any local ads in Virginia, Colorado and Pennsylvania from September 2 to 20, according a Priorities USA spokesman, citing strong poll numbers for Clinton in those states.

This move, which is meant to both save money and signal confidence, extends suspensions in advertising in Colorado and Virginia and adds Pennsylvania to that list. And it could always be amended if the super PAC felt it was necessary.

"We know, at the moment, these are tough states for Donald Trump and there isn't as much of a need for us to air ads there," said Justin Barasky, a Priorities USA spokesman, who added that the group has no plans to expand their battleground map before Labor Day.

Polls show Clinton with healthy leads in Colorado, Virginia and Pennsylvania. A recent NBC News/Wall Street Journal/Marist poll found Clinton up 13 points in Virginia -- 46% to 33%; up 14 points in Colorado -- 46% to 32%; and up 11 points in Pennsylvania -- 48% to 37%.

Priorities decided earlier this month to go dark in certain markets in Virginia and Colorado, but said at the time that they would go back on the air on August 16. With polls going Clinton's way, the group decided against doing that, and added Pennsylvania to their list of states they will go dark in.

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