WASHINGTON (AP) — A new TV ad that urges Congress to oppose U.S. military strikes against Syria underscores the difficulty President Barack Obama is having in getting liberals to support him.

The 30-second ad paid for by the liberal activist group MoveOn.org says the U.S. didn't set out to spend eight years at war in Iraq and a decade in Afghanistan and predicts the same thing will happen if Congress approves military action in Syria. The ad concludes by telling Congress, "Don't lead us down this road again." Viewers are urged to call Congress to voice opposition.

MoveOn says the ad will air this week on MSNBC, with a heavier rotation around Obama's address to the nation on Tuesday night.

The group is spending in the "mid five figures" to air the ad.