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The group said it would spend $1.6 million to run ads through Aug. 6 that focus on Sens. Bill Nelson of Florida, Claire McCaskill of Missouri, Jon Tester of Montana, Ben Nelson of Nebraska and Sherrod Brown of Ohio. The Democrats are all considered top targets by national Republicans and could determine whether Democrats maintain control of the Senate in 2013.

The ad campaign announced Tuesday features constituents urging the lawmakers to cut spending and not raise taxes. “No more blank checks,” the constituents say in the ads, which promote a website by the same name, www.nomoreblankchecks.com.

Mr. Obama and Congress face an Aug. 2 deadline to avoid a potential government default.

Crossroads and its affiliated organization, American Crossroads, spent $38.6 million in 2010 and were considered pivotal in helping Republicans capture control of the House and reduce the Democrats’ margin in the Senate. The group has said it will spend $20 million this summer on a series of ads critical of Mr. Obama and Democrats in the House and Senate.

NEW HAMPSHIRE

Huntsman building big team, changing tone

CONCORD — Jon Huntsman Jr.’s campaign says he’ll be more aggressive in his quest for the White House, but the Republican presidential hopeful offered only subtle jabs at his opponents Tuesday.

Speaking at Dartmouth College’s lecture series, the former ambassador to China said President Obama is a good guy, but has failed the country. He used words like “immoral” and “un-American” to describe the direction of the country.

Mr. Huntsman aimed a veiled criticism at Mitt Romney, the early front-runner in New Hampshire’s Republican primary contest. He didn’t use the former Massachusetts governor’s name, but said some candidates are running away from their record.

Mr. Huntsman, a moderate on some issues, is not competing in the Iowa caucuses. Instead he’s launching a huge paid New Hampshire operation to take on Mr. Romney.

SEC

Biggest traders required to report trade activity

Large traders will be required to register with the government and make available more information about their trades under a rule adopted by federal regulators.

The Securities and Exchange Commission agreed unanimously on the rule, which would take effect in 60 days. The rule is a response to the May 2010 “flash crash,” when the Dow plunged more than 600 points in five minutes. Regulators say tracking large trades will make it easier to understand unusual activity in the market.

The rule applies to investors who trade more than 2 million shares or $20 million a day. It also applies to investors who trade 20 million shares or $200 million a month.

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