NRA speakers slam IRS, media, along with Michael Bloomberg

Several high-profile Republicans joined the National Rifle Association in Indianapolis for the first day of its annual convention on Friday, pledging their commitment to Second Amendment rights and also rallying NRA members around the red-meat issues that should drive conservatives to the polls this November, like IRS targeting and religious freedoms.

"We need your help not just on the Second Amendment, but on every piece of the First Amendment and all the other amendments that grant us our freedom," former Sen. Rick Santorum, R-Pa., told the audience. He warned that those opposed to gun freedoms are "attacking your other freedoms and they're working on every front."

He urged the attendees to stay politically engaged not just on gun issues but in other areas as well. "If you bring the same toughness, the same truth, the same energy and passion the NRA can not only save the Second Amendment, you can save America," he said.

Along with gun rights, Santorum charged that the freedom to worship is under attack from the Obama administration.

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"They want to tell you it's OK to do whatever you want inside the church, but once you come outside of that church... I get to tell you what to do... whether you can hold certain beliefs on the institution of marriage," he said.

Senate Minority Leader Mitch McConnell, R-Ky., pledged that if given the opportunity to be majority leader in the Senate next year, he'll work with other Republicans to advance more protections for gun owners.

The Republican leader then talked at length about his opposition to new proposed IRS rules that would limit the political activity of certain tax-exempt groups. Conservatives, along with some traditionally Democratically-aligned groups, have said the proposed rule change would hamper freedom of speech.

"The Second Amendment isn't the only amendment -- not the only one -- under assault these days," McConnell said. He railed against "one of the largest and most powerful agencies of the government... using its resources to target and harass political opponents."

NRA president Wayne LaPierre similarly said, "The IRS is now a weapon to punish anyone who disagrees with them, and that means every one of you." He also blasted a "national news media that fails to provide a level playing field for the truth."

LaPierre warned that "this election is going to be a bare-knuckle street fight" and that in 2014, liberals are "laying the groundwork to put a Clinton back in the White House."

More than 70,000 people are expected to attend the NRA convention. Santorum remarked that "the crowds are getting bigger because the threat [to the Second Amendment] is getting bigger."