Determine the valence intensity of the following tweet, considering the mental state of the author. Assign a real number between 0 and 1, where 0 denotes extremely negative and 1 denotes extremely positive.
Tweet: @SenRonJohnson @Neomi_Rao #25thAmendmentNow Do you mean 'regulations' like clean air and water? Because who needs that, right? #sarcasm