STEALING EACH OTHERS' THUNDER ?

The two major parties - Congress & BJP- are both accusing each other ( rightly so ) of stealing each others' policies and schemes . Whereas Congress has gone ahead by taking the entire credit for the Prime Minister's rural roads scheme ( which was initiated and partly implemented during the Atal regime ) BJP has usurped the Congress' loan waiver scheme for farmers by claiming it as theirs ....and so on In a way each of the two has tried to steal the others' thunder . When doe s this kind of a thing happen? Whenever the contestants do not have any thunder of their own.