WASHINGTON - President Barack Obama is pushing lawmakers to pass gun control legislation, despite some factors working against him.

The president made an emotional appeal to Congress while surrounded by mothers that have been affected by gun violence.

One poll, however, shows support for tougher gun laws dropping 10 points to 47 percent, from 57 percent in December.

In addition, the Senate's plan for next month lacks some key components the president pushed for, including universal background checks and a ban on some high-capacity magazines. Four GOP senators, including Florida's Marco Rubio (R), say they'll block any legislation that puts more restrictions on gun owners.

The president is getting support from groups like Mayors Against Illegal Guns, which released a new ad featuring relatives of the Sandy Hook victims.