When will Senator Lopez issue a public apology for accusation regarding the Tea Party?

The answer to your question, I fear, is never. When you are a "liberal," it's different with the "mainstream" media, which wasted no time at all in blaming the attempted assassination on conservatives. This, of course, occurred while the blood was flowing in Arizona - and key elements of the background of the despicable punk who attempted to assassinate Gabrielle Giffords - like his atheism, his pot smoking, etc. are being given short shrift in the same media. Thank heavens that there are alternative sources out there - at least for now. (I say "at least for now" because in the current poisoned political atmosphere a question mark appears to hang over how long these alternative sources are likely to last.)