A file image of a protest march in Moscow, December 24, 2011. (Photo: Bogomolov.PL/Wikipedia)

What happened in Moscow on Thursday would have been unthinkable just a few weeks ago. There was a protest rally in the Russian capital. Now that by itself would have been unusual, but Thursday's demonstration went off without any arrests. The demonstrators protested at Pushkin square against the detention of activist Sergei Udaltsov. Anchor Marco Werman talks to The World's Jessica Golloher to get more details.

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