Who is this Sanford man who killed a teenager, who sparked a national outcry over racial profiling, vigilantism, and sweeping shoot-first self-defense laws in 23 states?

Who is George Zimmerman?

What we know about the 28-year-old crime watch volunteer is that he claims he shot in self-defense after chasing down 17-year-old Trayvon Martin against police orders -- although dispatch tapes are not entirely clear on how emphatically he was told to stand down.

The candidates in the race for the Republican presidential nomination are focusing on Wisconsin this week as Rick Santorum, Ron Paul and Newt Gingrich look to slow Mitt Romney down in the Badger State.

While Maryland and the District of Columbia also hold primaries April 3, Wisconsin is the largest prize of the three with 42 delegates to the Republican convention in Tampa. A Rasmussen Reports poll released at the end of last week found Romney leading there with 46 percent, followed by Santorum with 33 percent, Paul with 8 percent and Gingrich with 7 percent.

Despite losing Louisiana's Republican presidential primary to Rick Santorum on Saturday, Mitt Romney looked to rally conservatives behind his candidacy on Monday as he unveiled the support of three leading conservatives.

Veteran Florida Republican leader Al Cardenas, formerly with the Republican Party of Florida and now the chairman of the American Conservative Union, announced he is backing Romney for the Republican presidential nomination.

People always think theyre behaving ethically, even when theyre being hauled off in handcuffs," said veteran newspaperwoman-turned-Leon County Commission candidate Mary Ann Lindley at a community conversation on ethics.

As the U.S. Supreme Court begins three days of hearings on the constitutionality of Obamacare Monday morning, Justice Elena Kagan is in the spotlight.

President Barack Obama's former solicitor general, whom he elevated to the high court, is expected to participate in the oral arguments -- despite repeated calls for Kagan to recuse herself, or to at least better explain her reasons for staying on the case.

In a letter to Kagan on March 22, Judicial Watch stated:

Rod Smith's attempt to keep politics out of the Trayvon Martin tragedy is honest and courageous and entirely the right thing to do.

With the new Senate maps expected to easily pass the House next week, lawmakers in the upper chamber and potential candidates for those seats are beginning to evaluate their electoral futures.

For a few, the decisions are where and whether to run for another term. And at least one legislative leader is already openly pondering whether to serve out the four-year term he would be awarded by the literal bounce of the ping-pong ball.

This was supposed to be a week focused on the drawing of political lines.

Instead, Florida was forced this week to think about the definition of other lines -- the line between self-defense and murder, and the racial lines that evidently still divide who can consider themselves safe on a walk back from the store.

President Barack Obama's 17-minute video, "The Road We've Traveled," gives us an idea of how he wants to frame the issues in the fall election.

LAS VEGAS, Nev. -- As the sun rises and dabs Caesars Palace with morning rouge, irony struts down the strip of casinos, shops and nightclubs.