EXHIBIT 31.2SARBANES-OXLEY ACT SECTION 302CERTIFICATION OF CHIEF FINANCIAL OFFICERI, D. Craig Mense, certify that:1. I have reviewed this quarterly report on Form 10-Q of CNA Financial Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omitto state a material fact necessary to make the statements made, in light of the circumstances underwhich such statements were made, not misleading with respect to the period covered by this report; 3. Based on my knowledge, the financial statements and other financial information included in thisreport, fairly present in all material respects the financial condition, results of operations andcash flows of the registrant as of, and for, the periods presented in this report; 4. The registrant’s other certifying officers and I are responsible for establishing and maintainingdisclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) andinternal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f))for the registrant and have: a) Designed such disclosure controls and procedures, or caused suchdisclosure controls and procedures to be designed under our supervision,to ensure that material information relating to the registrant, includingits consolidated subsidiaries, is made known to us by others within thoseentities, particularly during the period in which this report is beingprepared;  b) Designed such internal control over financial reporting, or caused suchinternal control over financial reporting to be designed under oursupervision, to provide reasonable assurance regarding the reliability offinancial reporting and the preparation of financial statements forexternal purposes in accordance with generally accepted accountingprinciples;  c) Evaluated the effectiveness of the registrant’s disclosure controls andprocedures and presented in this report our conclusions about theeffectiveness of the disclosure controls and procedures, as of the end ofthe period covered by this report based on such evaluation; and  d) Disclosed in this report any change in the registrant’s internal controlover financial reporting that occurred during the registrant’s most recentfiscal quarter (the registrant’s fourth quarter in the case of an annualreport) that has materially affected, or is reasonably likely tomaterially affect, the registrant’s internal control over financialreporting; and5. The registrant’s other certifying officers and I have disclosed, based on our most recent evaluationof internal control over financial reporting, to the registrant’s auditors and the audit committeeof registrant’s board of directors (or persons performing the equivalent function): a) All significant deficiencies and material weaknesses in the design oroperation of internal control over financial reporting which arereasonably likely to adversely affect the registrant’s ability to record,process, summarize and report financial information; and  b) Any fraud, whether or not material, that involves management or otheremployees who have a significant role in the registrant’s internal controlover financial reporting.     Dated:  October 29, 2007 By  /s/ D. Craig Mense    D. Craig Mense    Chief Financial Officer