To denounce one's citizenship is quite different than renouncing one's citizenship. I've denounced my country a number of times for being an brutal imperial power unconcerned about the human rights of people in other countries, but I've never renounced my citizenship.
I also don't get why being in the Phillipines has anything to do with one's citizenship.

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

Thanks for bring the difference between renounce and denounce to my attention. I corrected my previous post to agree with the post to which I was replying.
As to the Phillipines, Obama never lived there. He lived in Indonesia.