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Th morni this morning on "world news now" -- new insight into the boston bombing investigation. was the younger suspect who hid in a boat as dangerous as federal agents believed? >> poison investigation. who sent ricin-laced letters to the president and other law makers? after one suspect is released, fingers are being pointed at another. we'll bring you the strange developments. hometown help. actor mark wahlberg wants to do something he hasn't done in years to help boston heal. the details are ahead in "the skinny." >> later, ooh baby, look at the moves. dance steps that may captivate yo...

Th morni this morning on "world news now," strategy session. the romney campaign puts an intense new focus on battleground states. >> the move comes with polls showing the gop nominee trailing in key states that could swing the election. it's monday, september 24th. >> announcer: from abc news, this is "world news now." good morning, everyone. i'm t.j. winick. rob nelson is on assignment this morning. >> great to have you here, t.j. >> great to be here. >> we're both a little sleep deprived, so bear with us, everybody. i'm paula faris. in a moment, what to look for in the political week ah...