Guardian Daily podcast: Tarnishing the al-Qaida brand

The Guardian's home affairs editor Alan Travis on the counter-terrorism unit set up to tarnish brand al-Qaida.

Political columnist Martin Kettle reports from Denver's Pepsi Centre on the Democratic convention.

Research by a centre-left think tank claims the government has under-estimated the economic benefits of migration as the Guardian's political correspondent Alegra Stratton explains.

Plus Luke Harding on the Russian parliament's backing for South Ossetia and Abkhazia to become independent.