Jammu and Kashmir Chief Minister Omar Abdullah today criticized senior Congress leader Mani Shankar Aiyar for "mocking" at the "humble" background of BJP's prime ministerial candidate Narendra Modi, saying such remarks would not help the UPA's campaign. br br "Modi has a lot of negatives but his humble origins are a positive some of us can't claim. We aren't helping our campaign by mocking him," Omar wrote on micro-blogging website Twitter in an apparent reference to the Congress leader's remarks.