<apex:pageBlock tabstyle="Campaign" title="Campaign Members" >
        <apex:pageBlocktable value="{!MemberList}" var="CMList" rendered="{!NOT(ISNULL(MemberList))}">
        <apex:column value="{!CMList.Id}"/>
        <apex:column value="{!CMList.ContactId}"/>
        <apex:column value="{!CMList.Status}"/>
        <apex:column value="{!CMList.FirstRespondedDate}"/>
        
 </apex:pageBlocktable>

...

List<CampaignMember> MemberList;

public List<CampaignMember> getMemberList(){

if(MemberList == null) MemberList = [select ID,ContactId,Status,FirstRespondedDate from CampaignMember where CampaignId = :ApexPages.currentPage().getParameters().get('id') ];

return MemberList;

}
...