In a videotaped message posted on her Web site, Clinton said she was eager to start a dialogue with voters about challenges she hoped to tackle as president — affordable health care, deficit reduction and bringing the “right” end to the Iraq war.

“I’m not just starting a campaign, though, I’m beginning a conversation with you, with America,” she said. “Let’s talk. Let’s chat. The conversation in Washington has been just a little one-sided lately, don’t you think?” ...