most famous alum, carlos santana. >> wow. who knew? >> i tweeted him last night. >> top trending story on our webpage. by far. >> very impressive. thank you, vern. >>> if you are tired of ads popping up in your twitter feed, there's a way around it. it will cost you. twitter is considering a premium subscription. we'll have more at 6:00. >> "cbs evening news" is next. ♪ captioning sponsored by cbs >> ninan: what's next for president trump? and what's next for health care after mr. trump failed to unite his party on repealing and replacing obamacare? also tonight, a social media campaign to find missing children creates confusion in the nation's capital. >> how are you, by the way? you're here. >> ninan: we meet a street doctor making house calls to the etmeless. >> reporter: what better population to heal? >> you could not find a more grateful population. >> ninan: and on the sidewalks of silicon valley, make way for these self-driving delivery robots. they're on a roll. >> reporter: can you see a day when there's a whole fleet of thes

. >> ♪[music] >> bay area's own carlos santana.feel good celebration songs today. this was requested off of our twitter page. john. thank you, john. every friday we do this. we usually have a theme. just use the hashtag #ktvu on facebook, twitter or instagram. ♪[music] >> it is st. patrick's day. and in san francisco, some local dancers are bringing some irish joy to city hall. >> let's take you live where we find tara moriarty. hey, tara. >> reporter: happy st. paddy's day to you guys. >> it is not the t. i learned that from my irish friends. they get really upset if you use the t. >> we have studios located in walnut creek and san francisco. >> reporter: great. let's cue the music here and we can take a look at some of the folks who have gathered out here. these darling children will be doing the soft shoe. >> correct. they're actually dancing a reel right now and in a traditional style. they're holding the hands were partners. irish dancing started with group dancing, party dancing. that's where it traditionally comes from. it i