WASHINGTON - With his party demoralized by electoral setbacks, President Barack Obama told fellow Democrats on Saturday he would press ahead with his health care proposal and other pieces of his ambitious agenda, rejecting suggestions that a more cautious approach might minimize losses in the upcoming midterm elections. Obama, who left the White House during a blizzard, sought to rally Democratic National Committee members in a speech that was part pep talk and part prescription for what the party must do to overcome problems culminating in the loss of the Massachusetts Senate seat held by the late Democratic icon, Edward Kennedy. Trimming goals and postponing hard choices is the wrong approach, the president said. The political climate in Washington has become more fractured as lawmakers adjust to a new reality now that the Republicans' gain of a Massachusetts Senate seat has given them the ability to block bills using procedural hurdles. In an emotional high-point of his 20-minute address, Obama conceded the public wonders if elected officials can overcome the immense power of lobbyists and special interests and "confront the real problems that touch their lives." He said: "So just in case there's any confusion out there, let me be clear. I am not going to walk away from health insurance reform. I'm not going to walk away from the American people. I'm not going to walk away from this challenge. I'm not going to walk away from any challenge. We're moving forward." His voice rising, he added: "We are moving forward"