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Assure there was no ongoing public danger. >>heather: what other ways could the investigation still be hampered? >>reporter: authorities are zeroing in on tamerlan tsarnaev's trip to russia. did he have help and training when he was there? they say the russians are not being completely cooperative. >> the big unknown is still the six months, over six months, in russia. clearly, that is where they went from the process of radical ization to -- the older brother -- to violence. there is a lot we don't know. many say the russians need to step up to the plate and provide us better information. the...

Safe in schools. democrat joe manchin says he hopes his fellow nra members will look beyond the opposition of its leadership. >> nra has been the benchmark, it's the one we look torkswards. >> my wife disagreed with me and i still love her. >> reporter: now to sweeten the deal manchin and toomey added some things that gun owners and those groups have long championed things like lifting restriction on interstate travel and a commission to look into mental health and other things that might cause violence that people use guns with. when you look at the number here, the votes, manchin says he doe...

and may be in her system from the doctors to the pharmacies that provided them. sus dan candiotti has more about the funeral preparations. don, let's start with you. how are they examining those prescription drugs? >> they have subpoenaed several pharmacies and several doctors from the prescription medications found in whitney houston's hotel suite. they are doing that because they want to know exactly what was in her system. they are trying to trace the doctors and the pharmacies. one thing as they say would possibly lead to another, they are speaking to doctors here on the west coa...

just into "the situation room," brand-new poll numbers confirming a new lineup in the fight for the gop presidential nomination. the cnn/orc survey has just been released and shows a two-man contest at this point. the poll shows 34% of republicans asked say santorum is their choice. 32% say romney. with a sampling error, that means it's a statistic cal tie. ron paul and newt gingrich are far behind at 16 and 15%. first big picture, ron, what do you make of santorum's rise? >> i think this continues the extraordinary, even unprecedented volatility of this republican race. jessica, if ...

Politically to erupt like this on a scale and demanding mubarak step down, many experts we've talked to feel like anything really could be next. people have been talking about algiers, yemen. the slogan has been, today egypt, tomorrow yemen. but also libya, jordan even. that's the sense, we don't know what's coming next. never mind predictions online, some groups have written out a schedule of dates when protests will happen in each country. whether that holds true or not, there's a sense of not necessarily fear anymore among various groups but a sense of anticipation and that big, big unknown...