Merkel: CDU and CSU parties will start working on joint election platform

Angela Merkel on Germany's election trail

More European election news as Merkel starts to warm up the campaign wagon. The CSU is the sister party of Merkel's CDU.

In other news, the latest INSA poll shows the Social Democrat Party ahead of Merkel's CDU. Both parties are part of the "grand coalition" in charge at the moment.