5) Sen. Scott Brown, R-Mass., is delivering a speech on taxes this morning, and in his prepared remarks again hits opponent Elizabeth Warren on "you didn't build that." From the remarks: ad of the general election. It's a spot defending himself from Sen. Claire McCaskill's attacks and tying McCaskill to President Obama. It also hits her for not paying taxes on a private plane. "Claire McCaskill voted with Obama 98 percent of the time," says the ad's narrator. "Was the deciding vote to pass Obamacare. Voted to cut and gut Medicare by $700 billion. McCaskill voted to raise our taxes but didn't pay the taxes on her own private plane." 3) New Jersey Gov. Chris Christie will deliver the keynote address at the Republican National Convention in Tampa. Sen. Marco Rubio, R-Fla., will introduce Romney at the convention. 2) As both sides rush to define Ryan, he hit the Iowa State Fair without Mitt Romney Monday and was heckled. 1) It's primary day in Wisconsin, Florida, Connecticut, and Minnesota. Check out our primary previews for the GOP Senate primary in Wisconsin here, the GOP Senate primary in Florida here, and the Senate primary in Connecticut here. And don't miss our Florida House primary previews here, and the rest (where EMILY's List is playing a role) here. Stay tuned to Hotline on Call tonight for full coverage of results.4) Missouri GOP Senate nominee Todd Akin is up with his first
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