President Barack Obama wrapped up a two-day swing across Colorado Thursday with tough attacks on Republican challenger Mitt Romney and praise for the contributions of military service members. Obama told thousands at the state fairgrounds in Pueblo that the presumptive Republican nominee wants to raise taxes on the middle class to pay for tax cuts for the wealthy. He said "they have tried to sell us this trickle-down tax cut fair dust before." Obama also blasted Romney for backing an Arizona-style immigration laws. On Wednesday, Obama denounced Romney's stances on women's issues in Denver. Colorado is a pivotal swing state in November. Last week, Romney unveiled his own economic plan here and said Obama had failed to revive the economy.Obama highlighted his support for tax credits for wind energy manufacturers in Colorado and other states. The credit, which helps offset the cost of electricity production during a wind farm's first 10 years, is set to expire Dec. 31 unless Congress extends it. Obama supports extending the credit; Romney does not. Pueblo is home to a Vestas wind turbine plant. "At a moment when homegrown energy, renewable energy, is creating new jobs in states like Colorado and Iowa, my opponent wants to end tax credits for wind energy producers," Obama told a crowd at the Colorado State Fairgrounds. Without the tax credits, as many as 37,000 American jobs, including hundreds in Colorado, are at risk, Obama said, using figures from a study financed by the wind industry. During a Colorado Springs event later in the day, Obama focused more on the military and helping veterans in a city that has an Army base and two Air Force bases, The Gazette reported. Obama hailed the military for helping end the war in Iraq and killing Osama Bin Laden, the newspaper said. He talked about assisting members of the military when they return home and giving aid to veterans trying to find jobs. The president even praised the performances at the London Olympic Games by athletes who prepared at the Olympic Training Center in Colorado Springs. But Obama kept hammering on Republican opponents. "They don't have a plan and the one they've got, they can't sell," Obama said during the rally at Colorado College. Meanwhile, in a new fundraising email to supporters, Obama notes that he and Democrats "got beat by the other side" again in the race for campaign cash and declares flatly that "I will be outspent in this election." Obama adds, "That's OK. But only if we're able to keep the spending gap close enough so that our investments in a truly grass-roots campaign pay off." Across the country, Romney held a fundraiser Thursday on Park Avenue in New York City. "I need you to speak the truth -- talk to your friends and colleagues," he implored donors at a breakfast that raised more than $1.5 million for his campaign. Woody Johnson, a top fundraiser, told the crowd the campaign is "halfway" to its ultimate fundraising goals for the election. Romney was spending the rest of the day in Boston, preparing for Saturday's start of a four-state bus trip and an announcement, expected soon, on his running mate.