Congress leader Shakeel Ahmad has resigned from the post of the party's senior spokesperson. <br />''<br />''In a tweet, Mr Ahmad said, he has decided to file his nomination paper on Tuesday from Madhubani parliamentary constituency in Bihar. <br />''<br />''He said, he has sent his resignation to party President Rahul Gandhi. <br />''<br />''<span style="color: #222222;">Under the Congress, RJD and others' alliance in Bihar, Madhubani seat has gone to Mukesh Shahni's Vikasshil Insan Party.</span><br />